Monkey-wrench



L. P. CLARK.

MONKEY WRENCH.

APPLICATION'FILED FEB. s. 1919.

1 308,840. Patented July 8, 1919.

W/ 77VE56E6 INVENTOR MT/ ATTONEYj UNITED STATES PATENT onrrcn.

LESTER I. CLARK, OF FANWOOD, NEW JERSEY, ASSIGNOR F ONE-HALF '1'0 ANTHONY L. STEBOR, JR, OF PLAINFIELD, NEW JERSEY. I

MONKEY-WRENCH.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed February 8, 1919. Serial No. 275,741.

To all whom it may concern:

Be it known that I, Lns'rnn P. CLARK, a citizen of the United States, and residing at Fanwood, countyof Union, and State of New Jersey, have invented certain new and useful Improvements in Monkey-Wrenches, of which the following is a clear specification and illustrated in the annexed draw- The particular novel features are pointed out in the annexed claims.

My invention relates in ,eneral to a type of monkey wrench in whic the adjustment of the movable jaw is accom lished by re-.

leasing the jaw from the shan and by sliding it in to the desired position where it can be conveniently docked by a short twist of the wrench handle.

Referring to the drawings, Figure 1 is a side view of my improved wrench partl in section. Fig. 2 is a top view thereof. ig. 3 is a transverse section on the line III III in Fig. 1 seen in direction of thearrows, and Fig. 4 is a detailed perspective view of the member which looks the movable jaw in position.

Referring to Fig. 1, 1 is a rectangular shaped shank, at the outer end of which is fixed the stationary jaw 2 ofthe wrench. 3 80 is a movable jaw slidin ly disposed on shank 1, -and 4 is a key slig tly longer than the shank and embedded therein in a groove 5 as shown in Figs. 1, 2 and 3. The rear end of key 4 protrudes slightly beyond the rear end of the shank and has its under side tapered as shown at 11 in Figs. 1 and 4. To the rear end of shank 1 is threaded handle 7 by means of a threaded bushing 8 which extends into the handle 7 and is fastened thereto by riveted pin 10. The outer end of bushing 8 is formed into a tapered head 9 and of such form that it will engage the taperedv portion 11 of key 4 when the handle is screwed entirely on to the shank 1 as shown by the dotted lines in Fig. 1.

So long as the handle is slightly unscrewed from the shank as shown in full lines in Fig. 1, key 4 lies flat in its groove 5 in the shank and permits the sliding of the movable jaw 3 freely on the shank. The upper face of key 4 preferably serves as a bearing surface together with the shank for the movable jaw. After the jaw has been moved into the desired position on the shank, the handle is entirely screwed down on to the shank so engages the beveled portion 11 of key 4 thereby lifting its rear end out of the groove which causes the movable jaw 3 to jam on the shank so that it is locked thereto.

The eat advantage of this construction is that he locking and unlocking, of jaw 3 can be effected Without releasing the grip on .the handle, which is particularly convenient at such occasions where the other hand of the operator is engaged in holding parts of machinerv.

What I claim is:

1. A wrench of the character described having a shank, a jaw fixed at one of the shank ends and a movable jaw slidingly disposed on the shank, a jamming member extendin over the length of the shank and being em dded therein, and means at the handle end of the wrench for lifting the rear end of the jamming member t2 lock the movable jaw on the shank at the desired place.

2. In a wrench of the character described, having a shank, a jaw fixed at one of the shank ends and a movable jaw slidingly disposed on the shank, a jamming mem er extending over the length of the shank and embraced by the sliding jaw, a handle having screw-threaded engagement with the shank, the jamming member and the handle havinq engaging surfaces of wedge form, whereby on turning the handle, the jamming member ma be moved laterally at its end adjacent the andle to fix or release the movable j'aw.

3. A wrench having a shank, shank ends and a movable jaw slidingly disposed on the shank, a jamming member extending over the length of the shank and being embedded therein and forming part of the sliding surface for said movable jaw, a handle threaded on to the rear end of the shankand having a lifting headadapted to enga e and lift the rear end of the jamming mem r when the handle is screwed toward the jaws to lock themovable jaw on the shank at the desired lace.

L STER P. CLARK.

of the character described that head 9 of the handle a jaw fixed atone of the 

